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9x x 4 0
x 4 9x 2 10 0
x 4 )( 9x 1 )u003d 0
x 4 9x 2 400 0
x 4 9x 2 18 0
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9x 3 4 x )u003d 0
x 4 9x 2 20 0
x 2 9x 4 0
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